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I have seen 4 different varieties of bolt used in the 1928 west hurley 22 machine guns. 1. An actual hammer and moving firing pin basically like a .45 acp thompson. 2. Fixed firing pin (machined or possibly welded steel) on the bottom of the bolt 3. Fixed firing pin on the top of the bolt face that is pinned in place 4. Flush fit, no actual firing pin. The bolt crushes the whole case rim which pops the primer. 3 and 4 never work well in my experience, and are the ones that I have modified the most to function. I follow the pattern of number 2. Number 3 with the firing pin on the top of the bolt face has problems as the round gets caught sliding up into place as it chambers. The gun can take the 30 ceiner mags with adaptor, the pps50 modufied drums, and the 22 insert 45 acp magazines. They will not work with the blackdog magazines. Also the magazines for the 1927A3 are the same except the fit is 1/10 height difference. (This can be adjusted if needed). Bad fitting extractors are common. Also rough chambers can be encountered also. I had one gun here that the inner steel barrel liner had slipped forward thus the headspace was long and you didnt get a primer pop.

Got Uzi and TSMG28 were collaborating on the project

We put together a valuation guide on our website here: https://www.webuyguns.com/machine-gun-valuation-guide Most of the models you have are listed there. It may help as a single general reference point. Hope it helps!